Implement a way to slow down the acceleration

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

src/Keyboardio-MouseKeys.cpp

@@ -5,6 +5,8 @@
 #include "KeyboardioFirmware.h"
 
 uint8_t MouseKeys_::mouseMoveIntent;
+uint8_t MouseKeys_::accelDelay;
+uint8_t MouseKeys_::accelDelayCounter;
 
 void MouseKeys_::loopHook(bool postClear) {
     if (postClear) {
@@ -19,8 +21,12 @@ void MouseKeys_::loopHook(bool postClear) {
 
     int8_t moveX = 0, moveY = 0;
 
+    if (accelDelayCounter == accelDelay) {
         if (MouseWrapper.mouseActiveForCycles < 255)
             MouseWrapper.mouseActiveForCycles++;
+        accelDelayCounter = 0;
+    } else
+        accelDelayCounter++;
 
     if (mouseMoveIntent & KEY_MOUSE_UP)
         moveY = -1;

src/Keyboardio-MouseKeys.h

@@ -8,9 +8,11 @@ class MouseKeys_ : public KeyboardioPlugin {
     MouseKeys_ (void);
 
     virtual void begin(void) final;
+    static uint8_t accelDelay;
 
  private:
     static uint8_t mouseMoveIntent;
+    static uint8_t accelDelayCounter;
 
     static void loopHook(bool postClear);
     static Key eventHandlerHook(Key mappedKey, byte row, byte col, uint8_t keyState);